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Posted by James Sweet on July 5, 2009, 6:50 pm
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Jon Danniken wrote:
> William Sommerwerck wrote:
>>> My drier sees 250VAC. Low voltage stuff in this house gets 125VAC.
>>> Everything is working just fine.
>> <sniff> <sniff> Is that burning cotton I smell?
>
> Drier has a temperature limiter, so although the slightly higher voltage
> results in a slightly quicker "turn on" time for the elements, they still
> are shut off at the same temperature regardless of incoming voltage.
>
> Jon
>
>
I rented a house for a while that had unusually high line voltage. It
varied from around 122V to 125V depending on the time of day. If it was
much higher than that, I'd be concerned, but anything from 115V to 125V
is pretty normal.
A friend of mine over in the UK is near the end of a long run from the
transformer that powers his street. His voltage varies considerably,
from as low as 220V to nearly 250V.
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Posted by James Sweet on July 5, 2009, 6:33 pm
Please log in for more thread options Bruce L. Bergman wrote:
> wrote:
>
>> I have been asked to offer an opinion in a sensitive situation.
>>
>> A machinist moved his shop across town and required some rewiring (3-phase
>> outlets, conduit, etc.) in order to locate some machines where he wanted
>> them.
>>
>> He hires a guy who's not a pro (and later discovers is not insured) but has
>> done shop wiring before and had a good attitude and track record. The guy
>> does good work. No complaints about the quality of his work.
>>
>> Owner throws the switch, all works fine.
>>
>> The story continues 4 weeks later when the very expensive CNC fries its
>> controller PCB to the tune of $4000.
>>
>> Turns out the voltage in the shop was upward of 245 and the taps in the CNC's
>> power supply were set for 220.
>>
>> What is the legal and moral responsibility of each party?
>>
>> What will not be helpful are replies about the character or intelligence of
>> either of the players or their actions.
>
> The nominal utility power as supplied is supposed to be 240V. 5
> volts over is a touch hot, but not out of the bounds of normal
> tolerances - turn everything on in the neighborhood some hot August
> afternoon with the AC units cranked, and tell me what the voltage
> reads then...
>
>
That is not always the case. I'm a little rusty when it comes to 3 phase
distribution, but I've dealt with some things like this in a machine
shop friends of mine own. The voltage depends on the service to the
building. Some shops have 208V and some have 240V, and we've had to
reconfigure machines from time to time that were purchased from other
locations, or run some off buck/boost transformers if they were not
configurable. Perhaps someone more knowledgeable can fill in the details.
It's good practice of course to measure the voltage and double check the
configuration of the particular machine prior to applying power.
$4K seems pretty high though, did anyone look into repairing the damaged
board?
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Posted by Gunner Asch on July 5, 2009, 7:40 pm
Please log in for more thread options wrote:
>Bruce L. Bergman wrote:
>> wrote:
>>
>>> I have been asked to offer an opinion in a sensitive situation.
>>>
>>> A machinist moved his shop across town and required some rewiring (3-phase
>>> outlets, conduit, etc.) in order to locate some machines where he wanted
>>> them.
>>>
>>> He hires a guy who's not a pro (and later discovers is not insured) but has
>>> done shop wiring before and had a good attitude and track record. The guy
>>> does good work. No complaints about the quality of his work.
>>>
>>> Owner throws the switch, all works fine.
>>>
>>> The story continues 4 weeks later when the very expensive CNC fries its
>>> controller PCB to the tune of $4000.
>>>
>>> Turns out the voltage in the shop was upward of 245 and the taps in the
CNC's
>>> power supply were set for 220.
>>>
>>> What is the legal and moral responsibility of each party?
>>>
>>> What will not be helpful are replies about the character or intelligence of
>>> either of the players or their actions.
>>
>> The nominal utility power as supplied is supposed to be 240V. 5
>> volts over is a touch hot, but not out of the bounds of normal
>> tolerances - turn everything on in the neighborhood some hot August
>> afternoon with the AC units cranked, and tell me what the voltage
>> reads then...
>>
>>
>
>
>That is not always the case. I'm a little rusty when it comes to 3 phase
>distribution, but I've dealt with some things like this in a machine
>shop friends of mine own. The voltage depends on the service to the
>building. Some shops have 208V and some have 240V, and we've had to
>reconfigure machines from time to time that were purchased from other
>locations, or run some off buck/boost transformers if they were not
>configurable. Perhaps someone more knowledgeable can fill in the details.
>
>It's good practice of course to measure the voltage and double check the
>configuration of the particular machine prior to applying power.
>
>$4K seems pretty high though, did anyone look into repairing the damaged
>board?
CNC electronics cost about 4-8 times as much to fix as normal
electronics. Shrug..its called :"the going rate" unfortunately.
Gunner
"Lenin called them "useful idiots," those people living in
liberal democracies who by giving moral and material support
to a totalitarian ideology in effect were braiding the rope that
would hang them. Why people who enjoyed freedom and prosperity worked
passionately to destroy both is a fascinating question, one still with us
today. Now the useful idiots can be found in the chorus of appeasement,
reflexive anti-Americanism, and sentimental idealism trying to inhibit
the necessary responses to another freedom-hating ideology, radical Islam"
Bruce C. Thornton, a professor of Classics at American University of Cal State
Fresno
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Posted by Archimedes' Lever on July 6, 2009, 9:16 am
Please log in for more thread options On Mon, 06 Jul 2009 03:48:34 -0700, Gunner Asch
> Hummm perhaps you havent any idea that Im one of the cheapest
>CNC service techs in So. Cal?
Bwuahahahahaha! I'll bet your skill set matches your price schedule.
Low and lame.
Hummm? Yeah, you'd probably be better at that.
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Posted by Gunner Asch on July 18, 2009, 6:54 am
Please log in for more thread options On Mon, 06 Jul 2009 06:16:42 -0700, Archimedes' Lever
>On Mon, 06 Jul 2009 03:48:34 -0700, Gunner Asch
>
>> Hummm perhaps you havent any idea that Im one of the cheapest
>>CNC service techs in So. Cal?
>
> Bwuahahahahaha! I'll bet your skill set matches your price schedule.
>Low and lame.
>
> Hummm? Yeah, you'd probably be better at that.
So hire me and find out for yourself.
"Lenin called them "useful idiots," those people living in
liberal democracies who by giving moral and material support
to a totalitarian ideology in effect were braiding the rope that
would hang them. Why people who enjoyed freedom and prosperity worked
passionately to destroy both is a fascinating question, one still with us
today. Now the useful idiots can be found in the chorus of appeasement,
reflexive anti-Americanism, and sentimental idealism trying to inhibit
the necessary responses to another freedom-hating ideology, radical Islam"
Bruce C. Thornton, a professor of Classics at American University of Cal State
Fresno
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